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Difficulty: MediumDirect Fact Retrieval

Naval high-pressure breathing air compressors use multi-stage filtration assemblies to produce breathable air for diving and firefighting. Atmospheric air first enters a mechanical separator to remove gross moisture droplets before passing into the desiccant tower. The desiccant tower utilizes activated alumina to absorb remaining water vapor, lowering the dew point to minus sixty-five degrees Fahrenheit. Downstream, an active hopcalite catalyst converts lethal carbon monoxide into carbon dioxide at ambient operating temperatures. Finally, an activated carbon canister captures residual hydrocarbon vapors before the purified air reaches the high-pressure storage flasks.

According to the passage, which component is used to convert carbon monoxide into carbon dioxide?

  1. A
    Activated alumina inside the desiccant tower
  2. B
    A mechanical moisture separator
  3. An active hopcalite catalystAnswer
  4. D
    An activated carbon canister

Answer

An active hopcalite catalyst
The passage explicitly states that an active hopcalite catalyst is responsible for converting carbon monoxide into carbon dioxide at ambient operating temperatures.

Step-by-Step Solution

1
Scan the text for the key term 'carbon monoxide' and locate the specific mechanism associated with its transformation.
Located the sentence: 'Downstream, an active hopcalite catalyst converts lethal carbon monoxide into carbon dioxide at ambient operating temperatures.'
Direct fact retrieval requires pinpointing the exact sentence where the target condition is described.
2
Match the explicit fact from the sentence to the answer choices without extrapolating.
Identified 'An active hopcalite catalyst' as the exact material performing the conversion.
The correct choice must strictly reflect what is stated in the passage.

Key Concept

Direct Fact Retrieval
Estimated Time:1m 0s
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Topics

Direct Fact Retrieval

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